/Engine/Source/Runtime/Core/Public/Math/SHMath.h
In-place addition operator. Changed from (*this = *this + InB;) to separate all calc to avoid LHS Now it calls directly += operator inTSHVector(avoidTSHVectorRGB+ operator)
[TSHVectorRGB](API\Runtime\Core\Math\TSHVectorRGB) & operator+= ( const [TSHVectorRGB](API\Runtime\Core\Math\TSHVectorRGB) & InB )